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It could be in the process of a DPF filter regen. It's not unusual to get some fluctuating at cruising speed with slight load while a regen is taking place. How many miles do you have?

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Without any scan device, only way to guess at Regen while driving is to see a drop in MPG, about 10MPG or so. Then if you shut off during a Regen, the engine fan will run to . cool down the 1200 degree DPF.

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Would a BlueTooth OBD Adapter and my Android phone get me any regen pending, etc info?
Yes, you can get the OBD 2 LX or MX adapter (some others also would work), then there is the Torque App, and Snipesy created a plug-in for Torque that can read just about every parameter you can think of, and better yet, it can command some functions, like a Service Regen for the DPF, and reset the DEF level sensor if needed. It's well worth it and not very expensive at all.
 
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